fix: preserve reasoning_content and thinking_blocks in session history

nanobot/providers/base.py

@@ -21,6 +21,7 @@ class LLMResponse:
     finish_reason: str = "stop"
     usage: dict[str, int] = field(default_factory=dict)
     reasoning_content: str | None = None  # Kimi, DeepSeek-R1 etc.
+    thinking_blocks: list[dict] | None = None  # Anthropic extended thinking
     
     @property
     def has_tool_calls(self) -> bool:

nanobot/providers/litellm_provider.py

@@ -16,7 +16,7 @@ from nanobot.providers.registry import find_by_model, find_gateway
 
 # Standard OpenAI chat-completion message keys plus reasoning_content for
 # thinking-enabled models (Kimi k2.5, DeepSeek-R1, etc.).
-_ALLOWED_MSG_KEYS = frozenset({"role", "content", "tool_calls", "tool_call_id", "name", "reasoning_content"})
+_ALLOWED_MSG_KEYS = frozenset({"role", "content", "tool_calls", "tool_call_id", "name", "reasoning_content", "thinking_blocks"})
 _ALNUM = string.ascii_letters + string.digits
 
 def _short_tool_id() -> str:
@@ -271,6 +271,7 @@ class LiteLLMProvider(LLMProvider):
             }
         
         reasoning_content = getattr(message, "reasoning_content", None) or None
+        thinking_blocks = getattr(message, "thinking_blocks", None) or None
         
         return LLMResponse(
             content=message.content,
@@ -278,6 +279,7 @@ class LiteLLMProvider(LLMProvider):
             finish_reason=choice.finish_reason or "stop",
             usage=usage,
             reasoning_content=reasoning_content,
+            thinking_blocks=thinking_blocks,
         )
     
     def get_default_model(self) -> str: